For hundreds of years it was a collection of stories passed by word of mouth. Then the monk "scribes" began writing those stories down in longhand about 600 years after Jesus. Of course the monks, in their attempt to be helpful and clear often altered and embellished these stories, creating the hundreds of Bible versions that exist today. The first English translation of the Bible didn't come about until 1380. The Mazarin Bible was the first Bible put in print by Gutenberg in the 1450's.

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The first version was a mixture of adaptations from other religions' tales of creation, exodus, commendments, virgin conception and virgin birth and messiah stories. Ever since those early versions it is being written and rewritten continuously. It is called translation, clarification and modernization. The wikipedia page on "Bible translations" gives you a good starting point into the rich history of the ever changing content of that book.